Method of forming closures of sealed receptacles



E, F. HULBERT. METHOD OF FORMING CLOSURES 0F SEALED REcEPTAcLEs.

APPLICATION FILED OCT. 4| 1919.

Paten'b' ad July 26, 1921.

, UNITED STATES PATENT OFFICE.

EDWIN r. HULBERT, or MILWAUKEE, WISCONSIN, ASSIGNOR TO JIFFY DESSERT COMPANY, OF WAUKESI-IA,

WISCONSIN, A CORPORATION OF WISCONSIN.

METHOD OF FORMING CLOSURES OF SEALED RECEPTAOLES.

To all whom it may concem:

Be it known-that I, EDWIN F. HULBERT, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Methods of Forming Closures of Sealed Receptacles,

of which the following is a specification, ref- 7. the accompany- 5 erence being had therein to in drawings, forming apart thereof.

y present invention relates to the method of forming a more perfect closure on sealed receptacles by a simple process without the necessity of use of paste, adhesion'of wax, metallic fastening means, or tongues, slots or other devices punched from the aper. I

y seal is capable of use on bags of the general form shown in the patent to O. E. Glidden and A. S. Nico, No. 1,101,430 of November 15, 1912, or that to A. ,S. Nico, in Patent No. 1,310,288 of July 15, 1919, and avoids the difficulties in closing encountered thereby in .that the completed seal-at the mouth of the receptacle is formed by lapping the paper at a-sharp angle and keeping it intact so that it is integrally sealed, and indentations or tongues are avoided as they never hold tightly, and give means whereby the receptacle if loaded with powdery material can work up through the folds and out through the indentations or slots. 1 am also enabled by my present method and means to make a bag and closure in two simple-operations as against the thrge or more steps that are necessary as now use I have found by experience that the methods of sealing and closing paper bags heretofore in use are defective in that theyattempt to make indentations, corrugations, etc. throughout the entire length of the closure, thus tearing and weakening the paper and affording openings through which the contents may escape. The elastic limit of paper is small and I therefore employ corrugationsof so small an extent as not to exceed the elastic limitof the paper.

In the figures, Figure 1 shows a side View with the mechanism I employ to create the closure after the bag has had the mouth thereof inserted therein. Fig. 2 shows the mechanism making the primary closure of the bag. ig. 3 shows it ready for the final Specification of Letters Patent. Application filed October 4, 1919. Serial N 0.

Patented July 26-, 1921. 328,576.

closure, and Fig. 4 shows the corrugations which may be added thereto if desired.

In the drawings 1 indicates the bag, 2 mouth thereof, 3

jaw having a'hinged angle piece 6 thereon provided with a toe piece 6 is hinged to the jaw by a pm 8 and has a motion limiting stop 9 so as to prohibit the toe 7 from falling below a predetermined point. The toe 7 1s kept in that is inserted, the together until they occupy the position found 1n Flg. 2, the jaw 3 moving into the relatlve position shown by the dotted' lines in The motion is then continued until the roundlng end of the jaw 3 strikes the face of the angle plate 6 causing the toe thereof 7 to rise vertically, thus forcing the mouth 2 of the bag 1 into intimate and firm contact with the notch 4- When the aws 3 and 5 separate the toe 7 drops immediately, leavin the mouth 2 of the bag 1 formed into a s arply acute angle and effecting a seal thereby.

The seal is completed by having 'two jaws 12, preferably, with partially corrugated bases, that approach one another and pinch the free ends of the lapped material of the bag 2 into intimate contact, giving a final closure as shown at 13 in Fig. 4. Owing to the small elastic limit of paper as generally used for this class of work, I find that a partial corrugating of the mouth is pref-- erable as not rupturing the paper, thus avoiding weakening the closure and defeating the whole object. All of this is accomphshed with but two sets of jaws.

Having thus completely described my invention, I claim:

1. The method of closing a sealed receptacle composed of a single sheet of material, which consists in folding the free margins of the mouth thereof upon themselves so as to 'form a sharply acute angle, pressing the same hard so that they will retain their position and corrugating portlons of the free marginal ends and the upper portion of the bag adjoining the mouth thereof into intimate contact.

2. The method of closing a Sealed recep- 1 jaws having a each other, one

' the. free marginal ends and 'jaws being formed,

adapted to coact with said nose and notch.

tacle composed of a single sheet rial, WhlOh consists in .ns I

so as to form a sharply acute angle, pressing of matethe same hard so that they will retain their position and corrugating only so much of, of the upper" portion of the bag adjoining the mouth thereof as will not transcend the elastic limit 4 of the material intointimate contact. 3. A machine for closing sealed receptacles ,whichconsists of a primary pair of jaws "having a lateral motion relative to each other, one of these jaws being formed is with an upwardly projecting nose and notch on one side thereof and the other of said with movable means marginal ends of the bag into intimate contact. I

5. A machine for closing sealed receptacles which consists of a primary pair of jaws having a lateral motion relative to each other, one of these jaws being formed with an upwardly projecting nose and a notch on one side thereof and the other of said jaws being formed with movable. means adapted to coact with said nose and notch, and a secondary pair of jaws having motion relative to each other and adapted to complete the closure tact, and corrugating portions thereof.

6. A machine for closing sealed receptacles which consists of a primary pair of jaws having a lateral motion relative to each other, one of these jaws being formed with an upwardly projecting nose and notch on one side thereof, the other of said jaws having pivoted bell crank'shaped means adapted to contact/with said nose and being provided with a toe thereon which on the said contact will coact with'said notch, a motion bell crank means beyond a predetermined point in the opposite direction, and a spring for holding sai bell .crank means in engagement with said motion limiting stop when not in the operative position.

:EDWI BERT.

limiting stop preventing the motion of said N F. HUL

Witnesses;

F. C. PFLUeRADs, Wu. Forums.

by pressing the free marginal ends of the bag into intimate con-. 

